Susan Rice, the national security adviser to former President Barack Obama, expressed interest Friday in challenging Maine Sen. Susan Collins in 2020, following the Republican’s announcement that she will vote to confirm Judge Brett Kavanaugh to the Supreme Court.

“Who wants to run for Senate in Maine? there will be an army of supporters with you,” former Obama White House spokeswoman Jen Psaki wrote on Twitter following Collins’s announcement of support for Kavanaugh.

Many thanks for the encourgement. I’m not making any announcements. Like so many Americans, I am deeply disappointed in Senator Collins’ vote for Kavanaugh. Maine and America deserve better. https://t.co/6oGFTFuO1Q

It was not immediately clear if Rice is serious about challenging Collins, who was first elected to the Senate in 1996. Collins won her last re-election bid by a wide margin, winning 68 percent of the vote against her Democratic challenger.(RELATED: Susan Collins Will Vote For Brett Kavanaugh)

Collins was heavily criticized after announcing her support for Kavanaugh, who has been accused of sexual misconduct by three women.

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